Incorrect Billing due to contract activation issue

During march 2015 I have taken out the following contract: R329 pm for 100 minutes, 200 sms's and 300 mb data. Since then I have not received ONE of those mb's per month. I have been paying a ridiculous amount on my bill every month for mb's that should have been part of my contract. <br> <br> A call was logged on 27/06, Nr *** with regards to this. Is has been 23days with no response!!! I have been at numerous stores, they can't help me. I have tried to call your call centre numerous times, but either my call is kicked off after a few minutes, or I am holding the line for about 15 minutes with no response.<br> <br> This is really not what I have signed up for when I have signed my contract.